SEC filings by CIENA CORP (ownership)| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|
| SC 13G/A | 2024-02-13 | VANGUARD GROUP INC | CIENA CORP | 15,026,070 | 10.4% | EDGAR |
| SC 13G/A | 2024-02-12 | FMR LLC | CIENA CORP | 14,726,348 | 10.2% | EDGAR |
| SC 13G/A | 2024-02-09 | FMR LLC | CIENA CORP | 11,317,654 | 7.8% | EDGAR |
| SC 13G/A | 2024-01-30 | BlackRock Inc. | CIENA CORP | 16,296,261 | 11.3% | EDGAR |
| SC 13G/A | 2023-06-09 | VANGUARD GROUP INC | CIENA CORP | 14,954,778 | 10.0% | EDGAR |
| SC 13G/A | 2023-02-09 | FMR LLC | CIENA CORP | 8,910,634 | 6.0% | EDGAR |
| SC 13G/A | 2023-02-09 | VANGUARD GROUP INC | CIENA CORP | 14,343,173 | 9.7% | EDGAR |
| SC 13G/A | 2023-01-26 | BlackRock Inc. | CIENA CORP | 17,139,924 | 11.5% | EDGAR |
| SC 13G | 2023-01-20 | BlackRock Inc. | CIENA CORP | 17,139,924 | 11.5% | EDGAR |
| SC 13G/A | 2022-02-09 | VANGUARD GROUP INC | CIENA CORP | 14,549,184 | 9.4% | EDGAR |
| SC 13G | 2022-02-09 | FMR LLC | CIENA CORP | 8,887,807 | 5.7% | EDGAR |
| SC 13G/A | 2022-01-27 | BlackRock Inc. | CIENA CORP | 15,514,375 | 10.0% | EDGAR |
| SC 13G/A | 2022-01-26 | BlackRock Inc. | CIENA CORP | 15,514,375 | 10.0% | EDGAR |
| SC 13G/A | 2021-04-12 | BlackRock Inc. | CIENA CORP | 15,877,338 | 10.2% | EDGAR |
| SC 13G/A | 2021-02-10 | VANGUARD GROUP INC | CIENA CORP | 14,312,747 | 9.3% | EDGAR |
| SC 13G/A | 2021-01-29 | BlackRock Inc. | CIENA CORP | 14,792,049 | 9.6% | EDGAR |
| SC 13G/A | 2020-02-12 | VANGUARD GROUP INC | CIENA CORP | 14,561,776 | 9.4% | EDGAR |
| SC 13G/A | 2020-02-04 | BlackRock Inc. | CIENA CORP | 15,698,042 | 10.2% | EDGAR |
| SC 13G/A | 2019-02-11 | VANGUARD GROUP INC | CIENA CORP | 13,338,962 | 8.5% | EDGAR |
| SC 13G/A | 2019-01-30 | BlackRock Inc. | CIENA CORP | 17,899,503 | 11.4% | EDGAR |